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The generator of AM EMFs consists of a battery-driven radiofrequency (RF) EMF generator connected to a 1.5 m long 50 ? coaxial cable, to the other end of which a stainless-steel spoon-shaped mouthpiece is connected via an impedance transformer. The RF source of the device corresponds to a class C amplifier operating at 27.12 MHz. The carrier frequency is AM with a modulation depth of 85±5%, whereas the modulation frequency is generated by a digital direct synthesiser with a resolution of 10-7. The treatment sequence is controlled by a microcontroller (Atmel AT89S8252, Fribourg, Switzerland), that is, duration of session, sequence of modulation frequencies and duration of each sequence can be programmed via PC over a RS232 interface. The RF output is adjusted to 100 mW into a 50 ? load, which results in an emitting power identical to that of the device used for the treatment of insomnia.
De multiplexing Address Data Bus (AD 7 - AD 0 ) As it is already discussed that lower order address bus (A 7 - A 0 ) is multiplexed with data bus (D 7 - D 0 ). Hence pins
What are procedures? Procedures are a group of instructions stored as a separate program in memory and it is known from the main program whenever needed. The type of procedure
What is the function of gate signal in 8254 timer? The 8254 has three independent 16-bit counters, which can be programmed to. Work in any one of possible six modes. Every cou
An audiomessage is band-limited to 15 kHz, sampled at twice the Nyquist rate, and encoded by a 12-bit natural binary code that corresponds to Lb = 212 = 4096 levels, all of which s
Q. Find the voltage gain of the overall circuit? (a) Consider the circuit of the inverting amplifier shown in Figure (a), including an ideal op amp. Show that the voltage gain
Q. With suitable diagram explains the working of a sweep frequency generator. Sol. A sweep frequency generator or sweeper is a special type of signal generator in which the o
Q. Explain Own-exchange routing? Own-exchange routing or distributed routing enables alternative routes to be chosen at the intermediate nodes. So strategy is capable of respon
Explain the magnetisation- curves of magnetic materials. The major characteristic of a ferromagnetic substance is domain structure of it. Every crystal of a ferromagnetic subst
Find the resistance of 1 km of copper cable having a diameter of 10 mm if the resistivity of copper is 0.017 x 10 -6 Ωm.
A balanced star-connected load is connected across a three phase 450V 50 Hz AC supply. Each load element has an impedance of 5+j12 Ω. Calculate: (i) The power factor of the
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